Adjustable die-stock.



No. 834,454. 'PATENTED OGT-30, 190 6.

B..BORDBN.

ADJUSTABLE DIE STOCK.

1 APPLICATION FILED FEB. 9. 1906..

B'SHBETS-SEEET 1, I

' B. BORDEN.

.PATENTED OCT. .30, 1906,

ADJUSTABLBDIE s'rocm APPLICATION, FILED P1119, 1905 a suns-sum z.

-fl(g.3.

UNI I TED STATES PATENT OFFICE.

BRADFORD BORDEN, OF WARREN, OHIO, ASSIGNOR TO THE BURDEN 'COMPANY, OF WARREN, OHIO, A CORPORATION OF OHIO.

ADJUSTABLE DIE-STOCK.

Specification of Letters Patent.

" Patented Oct.- 3o,.1eoe.

Application filed February 9, 1905. Serial No- 244,933-

iTo aZl w/wm/ it may concern.-

Be. it known that I, BRADFORD BORDEN, of Warren, 1n the county of Trumbull and State of Ohio, have invented certain new and useful ,Improvements in' Adjustable Die- Stocks; and Ido hereby declare the following tobe a full, clear, and exact description of the invention, such as will enable others skilled'in the art to which it appertains to make and use the same.

It has heretofore been sought to produce tapered threads on pipes and other metal bodies by means of radially-movable chasers which gradually recede from the pipe as the threading operation'progresses but so far as I am aware 1t has not been possible in such 4 devices for one set of c'hasers to operate on pipes of different sizes nor to regulate the e th of thecut on'any one size of pipe.

he ob ect of my invention is to provide an adjustable die-stock having means for adforth, and claims.

In the accompanyin is a front elevation. 1g. 2 is a front eleva-. tion with the-front late removed and with i justing-the chasers so as to regulatev the depth of the cut or accommodate pipes of different sizes and at the same time'efiect the cutting of tapered threads.

The invention will be hereinafter fullyset particularly pointed out in the parts in'section. 1g.. 3 is a verticallongi tudmal sectional view 'on line 3 3, Fig. 1.

Fig. 4 shOW the gll cation 0f mypresentimprovements t o a lc-stock havingsectional dies carryin the chasers. -t FigL5 is a section online55, ig. 2. I I

Referring to thedi awings, 1 designates the body or housin having'parallel end walls 2 andvinclined wa 1s "3, the latterbeing inclined toward each other. ;With in "radially-are ranged guideways 4 "arelocated chasers 5, having tapered cutting-threads'fi' on their inner ends. These chasers all radiatefrom the center'of o ening 7, wherein the pipe to be threaded is ocated. At their outer ends they are cut away and formed with grooves 8 and inclined walls 9, these latter conforming to the incline of walls} of the housing.

. l0 designates an adjuster of the type cov ered by Letters Patent of the United States No. 744,465, issued to me November-17,

1903. It is shown in the form of a frame 9 of the chasers.

will be observed that drawings, Figure 1 composed of corresponding side member's and a connecting portion, said side members having outer straight sides to conform to the walls 2 of the housing and inner inclined sides to conform to the inclined walls 3 of such housing and also to the inclined walls overlapping portions carrying tongues 12, which interlock with. the grooves 8 of the chasers, said tongues being extended the full. length of the side members. The connecting ortion' of the adjuster carries a set-screw 13 or limiting the inward movement of the ad-v juster and to permit the latter. to be so set that the chasers will. accomodate pies of different sizes or eiiect the of different depths, such screw rendering Theseside members have tting of threads readjustment unneces ary while the device is used'in further cuttin at the same gage. It the adjuster enga es each of the chasers, with the result that by turning the set-screw '13 or otherwise moving the ad uster'the several chasers will be simultaneously adjusted teward or away from the i center opening of the housing. A. coveringplate Misseeured to the front of the housmg'and serves to retain the chasers in their guideways; as well as to revent forward dether means may be ection of the adjuster. em loyed for this pur ose. lFrom therear of t e housing extends a sleeve-15, which I have shown as exteriorly threaded,- so as to fit or telescope in the .teriorly-threaded tubular body of the frame or work-holder 16, having set-screws 17 for centering'the pipe and c mping the workholder thereto. It is manifest, however, that-an suitable means may be employed for hol ing the work-holder, as when the device is employed on'a power-machine it is held in a vise. Axiall mounted on the tubular body of the workolder 16 is a collar 18,

in a projections hereof is secured one end of a I set-screw 13 the adjuster gradually moves outwardly as the housing travels inwardly, the adjuster carrying with it the several chasers. In this way I am enabled to form a tapered thread without leaving a bur at the inner end thereof.

It is manifest that before beginning the cutting operation the several chasers may be simultaneously adjusted by the turning of ed through one of the side walls 2 of the housing and designed to automatically hold the adjuster in its outward position as the threading operation is completed, so that the several chasers will be kept out of engagement with the pipe asthe stock is being returned to its starting-point.

In Fig. 4 I have shown my present improvement as applied to a diestock having sectional die-blocks 22, carrying Chasers 23, such die-blocks being inclined on their sides to conform to the inclined sides of the adjuster after the manner contemplated by my before-noted patent. In all other respects the invention is the same as hereinbefore disclosed, the adjuster being gradually moved outwardly during the cutting operation by the action of the wedge against set-screw 13, thereby gradually drawing the die-blocks apart as the cutting operation progresses.

- The advantages of my invention are apparent. It will be seen that by means thereof Iam enabled to readily adjust the chasers or die-blocks to regulate or control the depth of the thread before the cutting operation is commenced and that when once this adjustment is secured and the parts set for operation the chasers or die-blocks will be gradually moved outwardly during the cutting operation. It is also manifest that a die-stock having my present improvements may be bular body, an adjuster for simultaneously moving all the chasers outwardly as the worl: progresses, and means rotatable with said ousing for so moving the adjuster.

'2. The combination with the framehaving' a tubular body, of the chasers, the housing therefor having a sleeve telescoping said tubular body, an adjuster for simultaneousl moving all the chasers outwardly as the wor progresses, a wedge rotatable with said housing for so moving the adjuster, and a rotatable ring fixedly held relatively to the frame, said wedge being secured to said ring.

3. The combination with a Work-holder, of a rotatable die-stock movable toward and away from the work-holder, chasers mounted in the die-stock, a single element for moving all the chasers simultaneously, and means rotatable on said work-holder for so moving said chaser-moving element as the die-stock travels toward the work-holder as to gradually draw all the chasers outwardly.

4. The combination with a'work-holder, of means rotatable on said holder, a rotatable die-stock movable toward and away from,

the workholder, chasers mounted in the diestock, means for simultaneously moving all the chasers outwardly as they travel toward the worleholder, means for adjusting such chaser-moving means and the chasers, and means mounted on said rotatable means for engaging and gradually moving said chasermoving means outward as the die-stock travels toward the work-holder.

5. The combination with a work-holder, of

a collar rotatably mounted thereon, a diestock movable toward and away from the work-holder, chasers.mounted in said (liestock, an adjuster for moving all of said chasers simultaneously, and. means mounted on the collar for engaging said adjuster and gradually forcing it and t 1e chasers outward as the die-stock approaches the work-holder.

6, The combination with a work-holder, of means rotatably mounted on said holder, a rotatable die-stock movable toward and away from the work-holder, an adjuster for moving all of said chasers simultaneously, a set-screw carried by said adjuster, and a wedging-block carried by said rotatable means engaging said set-screw for moving the adjuster and through it the chasers as the die-stock travels toward the work-holder.

7. The combination with the die-stock, of a support therefor, a series' of radially-an ranged chasers, an adjuster engaging each chaser for moving all of them simultaneously, a-set-screw carried by said adjuster, a wedging-block engaging said set-screw and upon which the latter is designed to ride as the cutting o oration pro resses, andmeans for holding t e wedging-b ock to permit the said screw to travel thereon as'the die-stock moves at right angles to the plane of rotation of said wedging-block durin' the cutting operation, said wedging-blocE and die-stock rotating in unison. a

8. The combination with a die-stock havin'g straight guides arranged transversely thereof, of expansible cutters, an adjuster movable in the guides and having means for engagin and moving the cutters inward, a

'work-ho lder, a wedge held against movement arallel with the axis: of the workholder ut revoluble with respect thereto and arranged to engage the adjuster to move the same on the scribed.

gu1des, substantially as de-v ing Witnesses.

. BRADFORD BORDEN. Witnessesz FRANK S. OHRYsT, JOHN R. LACHMAR. 

